Your experiment should be designed with 5 levels of independent variable and 3 trials at each level. If you can't figure out how to design that many levels of independent variable, you can perform more tests at each level. For example three treatment groups of plants, but grow 10 plants in each treatment group + a control group.
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Your experiment should be designed with 5 levels of independent variable and 3 trials at each level. If you can't figure out how to design that many levels of independent variable, you can perform more tests at each level. For example three treatment groups of plants, but grow 10 plants in each treatment group + a control group.